Door latch and lock.



J. BRANSFORD. DOOR LATCH AND LOCK'.

APPLICATION man IULY 6.1917.

Elm van 01 I, (M zjwz/xyfogaf Patented Jan. 1,1918.

3 SHEETSSEEET 1.

J. BRANSFORD.

DOOR LATCH AND LOCK.

. APPLICATION FILED JULY 6| 1917.

1,251,631. Patented Jan. 1,1918.

' 3 SHEETS-SHEET 2.

LBRANSFORD.

DOOR LATCH AND LOCK.

APPLICATION FILED JULY 6. 1917.

1,251,631. Patehted Jan. 1,1918:

3 SHEETS-SHEET 3.

. JOSEPH BRANSFOBD, OF FELLOWS, CALIFORNIA.

Specification of Letters Patent.

noon LATCH AND LOCK.

Patented Jan. 1, 1918.

Application filed July 6, 1917. Serial No. 178,993.

T 0 all whom it may concern: I

Be it known that I. Josnri-I BnANsronD, a citizen of the United States, residing at Fellows, in the county of Kern and State of California, have invented certain new and useful Improvements in Door Latches and Locks. of which the following is a specification.

This invention relates to door locks of the class disclosed in Letters-Patent No. 1,102,567, granted to me July 7, 1911, the object of the present invention being to so improve and rearrange the mechanism as to increase the efliciency of the look. A particular object of the present invention is to provide means whereby the door may be locked from the outside and when so locked cannot be opened until a proper key has been inserted in the outside handle. Other incidental obj ects of the inventionwill appear as the de. scription of the same proceeds.

The invention is illustrated in the accompanying drawings and resides in certain novel features which will be particularly pointed out in the claims following the detailed description.

In the drawings:

Figure l is a perspective view showing my improved lock in its applied position;

Fig. 2 is a perspective view of one side plate with the handle attached thereto removed from the door;

Fig. 3 is a vertical longitudinal section through the handles and the bolt-retracting levers;

Fig. 1 is a section on the line 41 of Fig. 3;

Fig. 5 is a detail section on the line 5-5 of Fig. 8;

Fig. 6 is a detail perspective view of one bolt-retracting lever and the parts immediately adjacent the same, the several parts being shown as disassembled but in their proper relative positions;

Fig. 7 is a horizontal section on the line 77 of Fig. 3;

Fig. 8 is a detail perspective view of the members of the key-controlled lock;

Fig. 9 is a transverse section on the line 99 of Fig. 3;

b 1F ig. 10 is a detail perspective view of the The door 1 may be of any desired size and form and is provided on each side with a vertically disposed handle 2. The lock is indicated at 3 in the accompanying drawings at the upper ends of the handles, but it will be understood that whether the lock be disposed at the upper'or lower ends of the handles is immaterial, and either relative position may be employed as personal desires or other circumstances may suggest.

- constructed on one edge with a shoulder or stop 6 adapted to engage a cotiperating shoulder on the lock case 1 so that the extent to which the bolt may be projected may be limited. On the opposite edge of the bolt is provided a pin or stop 7 against which the front end of a spring 8 may bear. A longitudinally slotted filler 9 is fitted between one wall of the lock case and the edge of the bolt so as to form a guide for the spring 8 and the'pm 7; the pm being adapted to bear against a transverse shoulder on the lock case and thereby limit the movement of the bolt under the influence of the spring 8. By removing the filler and then reversing the bolt and subsequently replacing the filler, the bolt may be readily mounted so as to work properly in a door swinging in either direction. The bolt is provided with a transverse opening 11 to reduce the weight and near its rear end is constructed with a transverse opening 12 in which the inner ends of the bolt-retracting levers are received. The rear wall of this opening 12 is convex, as shown at '13, so that the inner ends of the bolt-retracting levers may work easily and effectively, and in both the upper and lower wall of the opening is a transverse groove or notch 14, one of which will be engaged by the dead latch accordingly as the door is hung to swing to the right or the left. It will be readily understood that the bolt is projected into engagement with the keeper by the spring 8 and is retracted when it is desired to open the door by the manipulation of one of the handles 2.

The handles'2 are rotatably fitted to the upper and lower supporting arms 15 which are secured to the side plates16 by screws 17 inserted through the said side plates into the inner ends of supporting arms, as will be readily understood. The supporting arms are cylindrical or hollow sleeves in form so as to iH'Old unnecessary weight and each handle 2 is provided at one end with a journai or trunnion 18 which rotatably engages an opening in the adjacent supporting arm near the outer end of the same. The handle 2 which is disposed at the inner side ot'the door is provided at its end opposite the trunnion or journal 18 with a circular stud 19 rotatably fitted in the ad acent supporting arm 15 and from this stud projects a flat sided tongue or lug 20 the flat side of the tongue bearing against the outer end of the bolt-retracting lever 21, as shown most clearly in Fig. 7, so that rotation of the handle will manipulate the lever to retract the bolt. The bolt-retracting lever 21 is pivotally mounted within a plug or circular filler 22 which is secured within the hollow supporting arm 15 and is transversely slotted to accommodate the oscillation of the lever 21, as shown most clearly in Fig. 6. The filler or plug 22 is also provided with an eccentrically disposed longitudinal opening 23 for the passage of the dead latch 24 and a second plug or filler 25 is fitted within the supporting arm 15 intermediate the ends of the same and againstthe filler 22 as will be readily understood on reference to Figs. 6 and 7.

The plug or filler is provided with a transverse slot 26 to accommodate the oscillation of the lever 21. the said slot conforming in shape and location to the slot 27 in the alug or filler 22 so that there will be no lateral or torsional strain upon the lever which would tend to bend it and make it inoperative. This second plug is also provided with a longitudinal eccentric groove 28 for the dead latch 2t and a slot 29 opening through the filler accommodates the stud or handle 30 of the dead latch. The supporting arm 15 is also provided with a longitudinal slot 31 so that the pin or handle 30 may project through the supporting arm and be readily manipulated by the person desiring to lock the door from the inside. The dead latch consists of a pin or rod of suitable length slidably mounted in the grooves 23 and 28 in proper posit-ion to engage the groove 1% of the bolt when it is desired to set the bolt against release. A leaf spring 32 is fitted within the outer end of the supporting arm 15 and so disposed as to bear upon the inner end of the rod or pin 24 and trictionally hold the same in either set position. It will be readily understood that while the pin may. thus be readily set so as to hold the bolt against retraction or permit movement of the same, it will be effectually held in the position in which it may be set.

The outer handle 2 at its end opposite the trunnion or journal 18 is not constructed to rotatably engage the adjacent supporting arm, but its end bears against a flattened portion of said arm, as shown at 38 in Fig. %l.

This end of the handle is constructed with an internal annular groove or recess 371 which receives an annular rib 35 on a turning plug 36 which plug is rotatably fitted in the end of the handle and also in an opening in the supporting arm as will be readily understood on reference to Fig. i. A fiat-sided tongue or lug 37 extends longitudinally from the plug 36 and the fiat face of the same bears against the bolt-retracting lever 38. Upon the lower end of the plug 36, is a diametrical rib 39 which is adapted to be engaged by a diametrical groove 40 in the upper end of a bolt etl which is slidably fitted in the handle and is equipped witha trictional holding device 42 preferably in the form of a split resilient ring seated in an annular groove in the bolt. The ring 42 by frictionally engaging the inner surface of the wall of the handle serves to hold the bolt in either its raised or lowered position. The bolt is mounted slidably and rotatably in the handle which has the upper portion of its bore reduced so as to fit closely around the bolt and thereby support the same against twisting. From the lower end of the bolt depends a tang 43 which slidably engages a diametrical groove 44 in the inner face of a plug 45 which is secured within the handle immediately below the reduced upper portion of the same. A second plug 46 is fitted within the handle so as to bear against the inner face of the plug 45 and thereby retain the tang &3 in engagement with. the groove n. The plugs 45 and 46 are fitted snugly in a transverse opening 47 in the handle and a set screw d8 is engaged in the body of the handle and in a threaded groove or recess 49 in the plug d6 to secure the same in place a pin 50 being inserted through the plug 45 from the inner face of the same into the wall of the handle so as to hold the said plugin its proper place. A key-receiving and guiding cylinder or barrel 51 is rotatably mount ed in the wall of the handle and the inner end of the said barrel is provided with an annular flange or head 52 which seats in an annular recess in the wall of the handle so that the barrel will be held against longitudinal movement by the said wall and the outer face of the plug 45. The key-hole slots 53 and 54 are formed in the barrel 51 and the plug 115 respectively and the tang 43 is constructed with a longitudinal slothaving a V-shaped notch 56 in one side wall. A key. indicated at 57 in Fig. 4, is provided to be inserted through the slots 53 and 54 and play in the slot 55. \Vhen the key is rotated in one direction the blade or wing of the same will engage the upper wall of the notch 56 and thereby lift the bolt so that the groove 40 in the bolt will engage'the rib 39 on the rotary plug 36 whereupon rotation of the handle will be imparted to the said plug and the flat-sided tangor extension 37 thereof caused to act upon the lever 38 to retract the door bolt 5. \Vhen it is desired to prevent opening of the door from the outside, the key 57 is turned in the opposite direction so that its wing or blade will bear upon the lower wall of the notch 56 and thereby depress the bolt 41 to the position shown in Fig. 4E, whereupon the groove 40 will be withdrawn from its engagement with the rib S9 and the handle may then rotate without imparting any motion to the plug 36.

From the foregoing description taken in connection with the accompanying drawings, it will be seen that I have provided an exceedingly simple and efficient lock whereby unauthorized opening of the door from the outside will be efiectually prevented. The door may be locked from the inside by merely throwing in the dead latch without the use of any key. The lock is particularly well adapted for many doors which are provided with ornate vertically disposed handles and the rotation of the handle will not cause fatigue upon the wrist of the operator. The several parts are few in number and simple in construction and arrangement so that the lock is not apt to" get out of order and may be produced and installed at a low cost.

Having thus described the invention, what is claimed as new is:

1. In a door latching mechanism, the combination of a door bolt, a handle, a plug rotatably fitted in the handle, means actuated by the plug to retract the door bolt, 21 key-controlled locking bolt mounted in the handle and constructed to engage said plug, and means within the handle whereby the rotation of the same will be imparted to said locking bolt.

2. In a door latching mechanism, the combination of a door bolt, a handle, a plug rotatably fitted in the handle, means whereby rotation of the plug may retract the door bolt, means for holding said plug against longitudinal movement, a key-controlled bolt slidably mounted in the handle and constructed to engage said plug, and retaining plugs fitted within the handle and engaging the said bolt whereby to prevent rotation of the same relative to the handle.

3. In a door locking mechanism, the com bination of a door bolt, a handle, a plug rotatably fitted in the handle, means whereby rotation of the plug may retract the bolt, a transverse rib on the end of the plug within the handle, a bolt slidably fitted in the handle and having a groove in its end adapted to engage said rib, and means within the handle to prevent rotation of the said bolt relative to the handle.

4:. In a door locking mechanism, the come bination of a door bolt, a handle, a turning plug fitted in the handle and held against longitudinal movement, means whereby rotation of the plug may retract the door bolt, a bolt slidably fitted in the handle and constructed to engage said plug whereby the rotation of the handle and the bolt will actuate the plug, a tang depending from the said bolt and constructed for engagement by a key, and retaining plugs fitted transversely in the handle and bearing against the opposite faces of the said tang to prevent rotation of the bolt relative to the handle.

5. In a door locking mechanism, the combination of a door bolt, a handle, a plug rotatably fitted in the handle and held against longitudinal movement, means whereby rotation of the plug may retract the door bolt, a key-controlled bolt fitted in the handle for sliding movement and constructed to engage said plug, a tang depending from the bolt and constructed to be engaged by a key, retaining plugs fitted transversely in the handle and bearing against the opposite faces of the tang, and a key barrel rotatably fitted in one wall of the handle and held against longitudinal move ment by the said wall and one of said retaining plugs.

6. In a door locking mechanism, the combination of a door bolt having a transverse opening therethrough and provided in a longitudinal wall of said opening with a transverse groove, a supporting arm extending laterally with respect to the door bolt, a support within said supporting arm having a transverse slot and provided with a longitudinal opening, a lever fulcrumed within the said transverse slot and having its inner end bearing against the wall of the opening in the door bolt, a rod slidably mounted in the longitudinal openings and engageable in the transverse groove in the bolt, a handle rotatably fitted in the outer end of the supporting arm and disposed laterally with respect to the same, and a member actuated by said handle to oscillate said lever.

In testimony whereof I aflix my signature.

JOSEPH BRANSFORD. a 8.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

